Pinhook Bog is quite possibly the most interesting section of Indiana Dunes National Park. It’s got an incredible natural history and outstanding plant biodiversity. Pinhook Bog was designated a National Natural Landmark in 1965 – a year before the park was established.
Cowles Bog is one of the most important areas of Indiana Dunes National Park. It’s located north of the Bailly Homestead and Chellberg Farm area.